Core-Shell Fluorescent Material for Stable High Emission Intensity
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Solution Overview
Problem
Fluorescent materials used in light-emitting devices face challenges in achieving high emission intensity, particularly due to issues with sodium content and specific surface area, which affect the stability and efficiency of the crystal structure.
Innovation Solution
A fluorescent material with a core-shell structure is developed, where the core part is composed of an inorganic compound with specific elemental composition and the shell part contains boron or silicon, optimizing the sodium content and specific surface area to enhance emission intensity. The material is produced through a firing process using high-purity raw materials, ensuring a spinel-type crystal structure and controlled elemental ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the specific surface area is increased to improve emission intensity, then the emission intensity improves, but the sodium content increases which deteriorates crystal structure stability
Solution Approach 1:
The patent optimizes the specific surface area parameter to a specific range (0.01 to 4.30 m²/g) and controls sodium content below 1700 ppm by mass, demonstrating parameter optimization to resolve the contradiction between emission intensity and crystal structure stability
Solution Approach 2:
The patent employs a core-shell structure where the core contains the fluorescent material and the shell contains boron or silicon elements, creating a composite material system that protects the core from sodium contamination while maintaining emission properties
2Illumination intensity
If a core-shell structure with boron or silicon shell is introduced to protect the core, then the emission intensity improves, but the manufacturing complexity increases
Solution Approach 1:
The fluorescent material is divided into distinct core and shell segments, with the core containing the fluorescent compound and the shell containing protective boron or silicon elements, allowing independent optimization of each part's function
Solution Approach 2:
The shell part is specifically designed with different elemental composition (boron or silicon) than the core, providing localized protection and different functional properties in different regions of the same material structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fluorescent material exhibits improved emission intensity, stability, and quantum efficiency, effectively addressing the limitations of previous materials by optimizing the sodium content and specific surface area, leading to enhanced light-emitting performance.
Implementation Method 1
Fluorescent material having excellent emission intensity
Data Source
AI summary
A fluorescent material has a core-shell structure. The core contains a crystal phase of an inorganic compound having Formula: MxMgaAlyOzNw (A); M represents a metal; × satisfies 0.001 ≤×≤ 0.3; a satisfies 0 ≤ a ≤ 1.0 - ×; y satisfies 1.2 ≤ y ≤ 11.3; z satisfies 2.8 ≤ z ≤ 18; and w satisfies 0 ≤ w ≤ 1.0. The shell is formed on at least a part of a surface of the core and contains boron and/or silicon. The core has a sodium content of 1700 ppm by mass or less and a specific surface area of 0.01 to 4.30 m2/g. A ratio Y/X of a peak area value Y of boron or silicon to a peak area value X of metal M present in the shell satisfies 0 < Y/X ≤ 0.095 in an EDX measurement of a cross section of the fluorescent material.